Malicious PDF — malware analysis report

Static analysis result for SHA-256 a261d41b62f0bab1…

MALICIOUS

PDF

86.2 KB Created: 2021-03-24 09:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4ccbd696916d3947ce180eda5008e6ea SHA-1: 72902a4c6365d431def58c95b7f9c3f84aefeddf SHA-256: a261d41b62f0bab1670c816c9a1fc8cf420f35fff23bcb9c36b105b50243f914
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a high number of embedded links. One critical heuristic identified links to known malicious redirector infrastructure, and another noted a large PDF link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=c5+corvette+z06+buyers+guide In PDF document text
    • http://jaralet.getenjoyment.net/rojufisigepibawasigo.pdfIn PDF document text
    • http://kelnoteres.xyz/mumewimakoxurevuxewiru1ej4e.pdfIn PDF document text
    • http://tumbochka.space/free_download_animation_bookstbsjm.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/46838967112.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/55690350093.pdfIn PDF document text
    • http://prolac.ru/projected_cash_flow_template_free3338c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metakibeme/40m_magnetic_loop_antenna_design.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_fc4b20992b5046b7a2c23f30b46f879d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88da10be-5441-47f8-a01e-fca8b707061c/how_to_reset_wifi_on_honeywell_lyric_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/articles_of_faith_james_talmage.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/lelejojok.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/74626292291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225fa569-8ef5-4648-960c-d48a681c2bb1/kemekafojeleseketujok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3d31c2-59eb-4569-93a3-d722b47434d0/kifemikijo.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_ad02ae7cfec740de85d016fafa0ae43a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/627ce014-ea3f-4956-afbb-ec2adef47547/is_netflix_the_king_historically_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/85650158272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e146d9-a85a-4d4d-8b4a-f458c104ed60/9311687760.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/bajrangi_bhaijaan_salman_khan_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/12174333750.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/momitoboxasipabenama.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/31916741998.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/2763293057.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 5540 bytes
SHA-256: 2751a720a3fe1247d0c982026f47cce6f561d4222510abad73ca52b83dad4e23
font_01_sfnt_off00012504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12504 11108 bytes
SHA-256: 5d861de27f0df27e87637f612650ee0a9a17fa58fa8e9ebd37e34da7b1c5b783

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